Oh, just remember that easy does it with curves unless you are trying for a special effect.  You can target specific areas by clicking on the smaller grids button at the bottom of the curves dialog box and placing a marker at each intersection.  This prevents unintended changes except where you want them.  A simple shalow S curve (with markers placed three quarters of the way up and down the line) is a great way to increase overall contrast in most photos. The dark tones are increased by moving the lower marker point down slightly and whites and lighter tones are brightened by moving the upper marker upward slightly. Using the up and down arrows  is a great way to control the selected marker.  You can target specific areas of a photo for change by control clicking on them in the photo.  Each click places a marker on the line for manipulation.  Curves are a joy to work with once you get to know them.  Happy curving!

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears